Author(s)

L. Murawski

Abstract

Axial vibrations of a marine shaft lines. Calculations - measurements comparison. L. Murawski Ship Design and Research Centre, Poland. Abstract A method of analysing axial vibrations of ship power transmission systems of direct propulsion, equipped with low speed internal combustion engines, is proposed. These vibrations may potentially endanger the safe engine operation, and may generate excessive excitation forces leading to a high level of vibration in the ship body and superstructure. The longitudinal vibrations of the shaft line are coupled with the torsional-bending vibrations through the crankshaft, and are caused by the hydrodynamic forces generated in the ship propeller. The author has devised a computer program to analyse this problem. Nonlinear algorithms to determine the dynamic characteristics of the thrust bearing, and of the main engine bearings are proposed in this research. A crankshaft deformation analysis to determine the torsional-bending-longitudinal vibration cou

Keywords